```css
/* ==========================
   GLOBAL
========================== */

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Segoe UI, Arial, sans-serif;
}

body{
    background:#eef3f8;
    color:#222;
}

/* ==========================
   HEADER
========================== */

header{
    background:#003366;
    color:#fff;
    text-align:center;
    padding:20px;
    box-shadow:0 3px 10px rgba(0,0,0,.2);
}

header h1{
    font-size:30px;
    margin-bottom:8px;
}

header h2{
    font-size:20px;
    font-weight:400;
}

/* ==========================
   CONTAINER
========================== */

.container{
    width:95%;
    max-width:1400px;
    margin:25px auto;
}

/* ==========================
   TOP BAR
========================== */

.topBar{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:15px;
    margin-bottom:20px;
}

.box{
    background:#fff;
    border-radius:10px;
    padding:18px;
    text-align:center;
    box-shadow:0 2px 8px rgba(0,0,0,.15);
}

.box h3{
    color:#003366;
    margin-bottom:8px;
}

.box p{
    font-size:24px;
    font-weight:bold;
}

.timerBox{
    background:#d62828;
    color:#fff;
}

.timerBox h3{
    color:#fff;
}

/* ==========================
   PROGRESS BAR
========================== */

.progressContainer{
    width:100%;
    height:12px;
    background:#dcdcdc;
    border-radius:30px;
    overflow:hidden;
    margin-bottom:20px;
}

#progressBar{
    width:0%;
    height:100%;
    background:#28a745;
    transition:.4s;
}

/* ==========================
   MAIN CONTENT
========================== */

.mainContent{
    display:grid;
    grid-template-columns:3fr 1fr;
    gap:20px;
}

.questionArea{
    background:#fff;
    border-radius:10px;
    padding:25px;
    box-shadow:0 2px 10px rgba(0,0,0,.15);
}

.questionHeader{
    border-bottom:2px solid #ddd;
    padding-bottom:15px;
    margin-bottom:20px;
}

.questionHeader h3{
    color:#003366;
}

.questionText{
    font-size:22px;
    margin-bottom:25px;
    line-height:1.6;
}

/* ==========================
   OPTIONS
========================== */

.options label{
    display:block;
    padding:15px;
    margin-bottom:12px;
    border:2px solid #ddd;
    border-radius:8px;
    cursor:pointer;
    transition:.3s;
}

.options label:hover{
    background:#edf5ff;
    border-color:#0d6efd;
}

.options input{
    margin-right:10px;
    transform:scale(1.2);
}

/* ==========================
   NAVIGATION
========================== */

.navigationButtons{
    display:flex;
    justify-content:space-between;
    margin-top:30px;
}

button{
    padding:12px 28px;
    border:none;
    border-radius:6px;
    cursor:pointer;
    font-size:16px;
    font-weight:bold;
    transition:.3s;
}

button:hover{
    transform:translateY(-2px);
}

#prevBtn{
    background:#6c757d;
    color:#fff;
}

#nextBtn{
    background:#0d6efd;
    color:#fff;
}

#submitBtn{
    background:#198754;
    color:#fff;
    font-size:20px;
    padding:14px 35px;
}

/* ==========================
   PALETTE
========================== */

.paletteArea{
    background:#fff;
    border-radius:10px;
    padding:20px;
    box-shadow:0 2px 10px rgba(0,0,0,.15);
}

.paletteArea h3{
    margin-bottom:20px;
    color:#003366;
    text-align:center;
}

#palette{
    display:grid;
    grid-template-columns:repeat(5,1fr);
    gap:8px;
}

.paletteBtn{
    width:45px;
    height:45px;
    border-radius:5px;
    background:#ddd;
    border:none;
    cursor:pointer;
    font-weight:bold;
}

.paletteBtn.current{
    background:#0d6efd;
    color:#fff;
}

.paletteBtn.answered{
    background:#28a745;
    color:#fff;
}

.paletteBtn.notAnswered{
    background:#dc3545;
    color:#fff;
}

/* ==========================
   SUBMIT AREA
========================== */

.submitArea{
    text-align:center;
    margin-top:30px;
}

/* ==========================
   RESULT SCREEN
========================== */

#resultScreen{
    width:90%;
    max-width:700px;
    margin:40px auto;
    background:#fff;
    border-radius:10px;
    padding:30px;
    box-shadow:0 3px 12px rgba(0,0,0,.2);
}

#resultScreen h1{
    text-align:center;
    color:#003366;
    margin-bottom:30px;
}

table{
    width:100%;
    border-collapse:collapse;
    margin-bottom:25px;
}

table td{
    border:1px solid #ddd;
    padding:14px;
}

table tr:nth-child(even){
    background:#f4f4f4;
}

/* ==========================
   REVIEW
========================== */

#reviewScreen{
    width:95%;
    margin:30px auto;
}

.reviewQuestion{
    background:#fff;
    padding:20px;
    border-radius:10px;
    margin-bottom:20px;
    box-shadow:0 2px 8px rgba(0,0,0,.15);
}

.correct{
    background:#d4edda;
    border-left:6px solid green;
    padding:10px;
    margin-top:8px;
}

.wrong{
    background:#f8d7da;
    border-left:6px solid red;
    padding:10px;
    margin-top:8px;
}

.hidden{
    display:none;
}

/* ==========================
   MOBILE
========================== */

@media(max-width:900px){

.mainContent{
    grid-template-columns:1fr;
}

.topBar{
    grid-template-columns:repeat(2,1fr);
}

#palette{
    grid-template-columns:repeat(6,1fr);
}

.questionText{
    font-size:18px;
}

}

@media(max-width:600px){

.topBar{
    grid-template-columns:1fr;
}

.navigationButtons{
    flex-direction:column;
    gap:12px;
}

button{
    width:100%;
}

#palette{
    grid-template-columns:repeat(5,1fr);
}

.questionText{
    font-size:17px;
}

}
```